Dithering

Some flat panels use only 6 bits per color channel, and are not able to display the 8-bit colors the video card outputs. But it is possible to simulate 8-bit colors with a 6-bit screen by turning on and off quickly the pixels. This process is known as dithering.

Diagnose

If you can see stripes on this image , then you don't have 8 bit colors. 64 stripes means your driver, video card or monitor is only able to render 6-bit colors.